US3278440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaped fine particle ferrites and method for their preparation
Assignee: Individual
•
Filing: 1960-11-22
•
Granted: 1966-10-11
•
Expires: 1980-11-22
Abstract
No abstract record available.
Inventors
- 👤 William J Schuele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:56
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/2608; G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/706; G11B5/70626; G11B5/70642; G11B5/70678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
204 words
A METHOD FOR PRODUCING ACICULAR FERRIT PARTICLES IN THE SINGLE-DOMAIN SIZE RANGE WHICH COMPRISES, PRECIPITATING A METAL SALT OF AN ALIPHATIC CARBOXYLIC ACID CONTAINING FROM 1 TO 5 CARBON ATOMS ON MICROSCOPIC ACICULAR IRON OXIDE PARTICLES HAVING A PARTICLE SIZE WITHIN THE SINGLE DOMAIN SIZE RANGE BY ADDITION OF AN AMMONIUM SALT OF SAID ALIPHATIC CARBOXYLIC ACID TO A DISPERSION OF SAID IRON OXIDE PARTICLES IN AN AQUEOUS SOLUTION OF A METAL SALT OF A STRONG MINERAL ACID, SAID AQUEOUS SOLUTION BEING AT A TEMPERATURE AT WHICH SAID AMMONIUM SALT IS SOLUBLE THEREIN, SAID METAL SALT BEING SELECTED FROM THE GROUP CONSISTING OF SALTS OF THE METALS COPPER, STRONTIUM, BARIUM DIVALENT CHROMIUM, DIVALENT MANGANESE, DIVALENT IRON, DIVALENT COBALT, DIVALENT NICKEL AND MIXTURES THEREOF, AND MIXTURES OF A LEAST ONE OF SAID SALTS WITH A METAL SALT OF A STRONG MINERAL ACID IN WHICH THE METAL IS SELECTED FROM THE GROUP CONSISTING OF CALCIUM, MAGNESIUM, AND ZINC SEPARATING THE PARTICLES FROM THE SOLUTION, AND HEATING SAID PARTICLES TO AN ELEVATED TEMPERATURE AT WHICH SAID METAL SALTS OF SAID ALIPHATIC CARBOXYLIC ACID DECOMPOSES TO THE CORRESPONDING OXIDE BUT BELOW THE TEMPERATURE TO DECOM POSED SAID METAL SALT OF SAID ALIPHATIC CARBOXYLIC ACID AND FORM SAID FERRITE.
Claim 2
Independent Claim
204 words
A METHOD FOR PRODUCING ACICULAR FERRIT PARTICLES IN THE SINGLE-DOMAIN SIZE RANGE WHICH COMPRISES, PRECIPITATING A METAL SALT OF AN ALIPHATIC CARBOXYLIC ACID CONTAINING FROM 1 TO 5 CARBON ATOMS ON MICROSCOPIC ACICULAR IRON OXIDE PARTICLES HAVING A PARTICLE SIZE WITHIN THE SINGLE DOMAIN SIZE RANGE BY ADDITION OF AN AMMONIUM SALT OF SAID ALIPHATIC CARBOXYLIC ACID TO A DISPERSION OF SAID IRON OXIDE PARTICLES IN AN AQUEOUS SOLUTION OF A METAL SALT OF A STRONG MINERAL ACID, SAID AQUEOUS SOLUTION BEING AT A TEMPERATURE AT WHICH SAID AMMONIUM SALT IS SOLUBLE THEREIN, SAID METAL SALT BEING SELECTED FROM THE GROUP CONSISTING OF SALTS OF THE METALS COPPER, STRONTIUM, BARIUM DIVALENT CHROMIUM, DIVALENT MANGANESE, DIVALENT IRON, DIVALENT COBALT, DIVALENT NICKEL AND MIXTURES THEREOF, AND MIXTURES OF A LEAST ONE OF SAID SALTS WITH A METAL SALT OF A STRONG MINERAL ACID IN WHICH THE METAL IS SELECTED FROM THE GROUP CONSISTING OF CALCIUM, MAGNESIUM, AND ZINC SEPARATING THE PARTICLES FROM THE SOLUTION, AND HEATING SAID PARTICLES TO AN ELEVATED TEMPERATURE AT WHICH SAID METAL SALTS OF SAID ALIPHATIC CARBOXYLIC ACID DECOMPOSES TO THE CORRESPONDING OXIDE BUT BELOW THE TEMPERATURE TO DECOM POSED SAID METAL SALT OF SAID ALIPHATIC CARBOXYLIC ACID AND FORM SAID FERRITE.
References Cited (Backward Citations)
US3047429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-10 | 1970-04-11 | 1970-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-10 | 1974-04-11 | 1974-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-10 | 1978-04-11 | 1978-10-11 | $7700.00 | Window Closed / Lapsed |